I don't really understand why VR helmets they aren't more successful. My first guess is that any console needs exclusive high-profile games to be successful, and producing many exclusive high-profile Meta Quest games is probably too expensive for current market adoption. A chicken-egg problem.
Or maybe the hardware price isn't low enough currently. The original Game Boy was successful with its low price despite its terrible screen. The Game Boy Color chipset was very underpowered compared to the competition but again more affordable.